devcoredump: remove the useless gfp_t parameter in dev_coredumpv and dev_coredumpm

The dev_coredumpv() and dev_coredumpm() could not be used in atomic
context, because they call kvasprintf_const() and kstrdup() with
GFP_KERNEL parameter. The process is shown below:

dev_coredumpv(.., gfp_t gfp)
  dev_coredumpm(.., gfp_t gfp)
    dev_set_name
      kobject_set_name_vargs
        kvasprintf_const(GFP_KERNEL, ...); //may sleep
          kstrdup(s, GFP_KERNEL); //may sleep

This patch removes gfp_t parameter of dev_coredumpv() and dev_coredumpm()
and changes the gfp_t parameter of kzalloc() in dev_coredumpm() to
GFP_KERNEL in order to show they could not be used in atomic context.

Fixes: 833c9545 ("device coredump: add new device coredump class")
Reviewed-by: NBrian Norris <briannorris@chromium.org>
Reviewed-by: NJohannes Berg <johannes@sipsolutions.net>
Signed-off-by: NDuoming Zhou <duoming@zju.edu.cn>
Link: https://lore.kernel.org/r/df72af3b1862bac7d8e793d1f3931857d3779dfd.1654569290.git.duoming@zju.edu.cnSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/devcoredump.c

@@ -173,15 +173,13 @@ static void devcd_freev(void *data)
  * @dev: the struct device for the crashed device
  * @data: vmalloc data containing the device coredump
  * @datalen: length of the data
- * @gfp: allocation flags
  *
  * This function takes ownership of the vmalloc'ed data and will free
  * it when it is no longer used. See dev_coredumpm() for more information.
  */
-void dev_coredumpv(struct device *dev, void *data, size_t datalen,
-		   gfp_t gfp)
+void dev_coredumpv(struct device *dev, void *data, size_t datalen)
 {
-	dev_coredumpm(dev, NULL, data, datalen, gfp, devcd_readv, devcd_freev);
+	dev_coredumpm(dev, NULL, data, datalen, devcd_readv, devcd_freev);
 }
 EXPORT_SYMBOL_GPL(dev_coredumpv);
 
@@ -236,7 +234,6 @@ static ssize_t devcd_read_from_sgtable(char *buffer, loff_t offset,
  * @owner: the module that contains the read/free functions, use %THIS_MODULE
  * @data: data cookie for the @read/@free functions
  * @datalen: length of the data
- * @gfp: allocation flags
  * @read: function to read from the given buffer
  * @free: function to free the given buffer
  *
@@ -246,7 +243,7 @@ static ssize_t devcd_read_from_sgtable(char *buffer, loff_t offset,
  * function will be called to free the data.
  */
 void dev_coredumpm(struct device *dev, struct module *owner,
-		   void *data, size_t datalen, gfp_t gfp,
+		   void *data, size_t datalen,
 		   ssize_t (*read)(char *buffer, loff_t offset, size_t count,
 				   void *data, size_t datalen),
 		   void (*free)(void *data))
@@ -268,7 +265,7 @@ void dev_coredumpm(struct device *dev, struct module *owner,
 	if (!try_module_get(owner))
 		goto free;
 
-	devcd = kzalloc(sizeof(*devcd), gfp);
+	devcd = kzalloc(sizeof(*devcd), GFP_KERNEL);
 	if (!devcd)
 		goto put_module;
 
@@ -318,7 +315,6 @@ EXPORT_SYMBOL_GPL(dev_coredumpm);
  * @dev: the struct device for the crashed device
  * @table: the dump data
  * @datalen: length of the data
- * @gfp: allocation flags
  *
  * Creates a new device coredump for the given device. If a previous one hasn't
  * been read yet, the new coredump is discarded. The data lifetime is determined
@@ -326,9 +322,9 @@ EXPORT_SYMBOL_GPL(dev_coredumpm);
  * it will free the data.
  */
 void dev_coredumpsg(struct device *dev, struct scatterlist *table,
-		    size_t datalen, gfp_t gfp)
+		    size_t datalen)
 {
-	dev_coredumpm(dev, NULL, table, datalen, gfp, devcd_read_from_sgtable,
+	dev_coredumpm(dev, NULL, table, datalen, devcd_read_from_sgtable,
 		      devcd_free_sgtable);
 }
 EXPORT_SYMBOL_GPL(dev_coredumpsg);

drivers/bluetooth/btmrvl_sdio.c

@@ -1515,7 +1515,7 @@ static void btmrvl_sdio_coredump(struct device *dev)
 	/* fw_dump_data will be free in device coredump release function
 	 * after 5 min
 	 */
-	dev_coredumpv(&card->func->dev, fw_dump_data, fw_dump_len, GFP_KERNEL);
+	dev_coredumpv(&card->func->dev, fw_dump_data, fw_dump_len);
 	BT_INFO("== btmrvl firmware dump to /sys/class/devcoredump end");
 }
 

drivers/bluetooth/hci_qca.c

@@ -1120,7 +1120,7 @@ static void qca_controller_memdump(struct work_struct *work)
 				    qca_memdump->ram_dump_size);
 			memdump_buf = qca_memdump->memdump_buf_head;
 			dev_coredumpv(&hu->serdev->dev, memdump_buf,
-				      qca_memdump->received_dump, GFP_KERNEL);
+				      qca_memdump->received_dump);
 			cancel_delayed_work(&qca->ctrl_memdump_timeout);
 			kfree(qca->qca_memdump);
 			qca->qca_memdump = NULL;

drivers/gpu/drm/etnaviv/etnaviv_dump.c

@@ -225,5 +225,5 @@ void etnaviv_core_dump(struct etnaviv_gem_submit *submit)
 
 	etnaviv_core_dump_header(&iter, ETDUMP_BUF_END, iter.data);
 
-	dev_coredumpv(gpu->dev, iter.start, iter.data - iter.start, GFP_KERNEL);
+	dev_coredumpv(gpu->dev, iter.start, iter.data - iter.start);
 }

drivers/gpu/drm/msm/disp/msm_disp_snapshot.c

@@ -74,8 +74,8 @@ static void _msm_disp_snapshot_work(struct kthread_work *work)
 	 * If there is a codedump pending for the device, the dev_coredumpm()
 	 * will also free new coredump state.
 	 */
-	dev_coredumpm(disp_state->dev, THIS_MODULE, disp_state, 0, GFP_KERNEL,
-			disp_devcoredump_read, msm_disp_state_free);
+	dev_coredumpm(disp_state->dev, THIS_MODULE, disp_state, 0,
+		      disp_devcoredump_read, msm_disp_state_free);
 }
 
 void msm_disp_snapshot_state(struct drm_device *drm_dev)

drivers/gpu/drm/msm/msm_gpu.c

@@ -317,8 +317,8 @@ static void msm_gpu_crashstate_capture(struct msm_gpu *gpu,
 	gpu->crashstate = state;
 
 	/* FIXME: Release the crashstate if this errors out? */
-	dev_coredumpm(gpu->dev->dev, THIS_MODULE, gpu, 0, GFP_KERNEL,
-		msm_gpu_devcoredump_read, msm_gpu_devcoredump_free);
+	dev_coredumpm(gpu->dev->dev, THIS_MODULE, gpu, 0,
+		      msm_gpu_devcoredump_read, msm_gpu_devcoredump_free);
 }
 #else
 static void msm_gpu_crashstate_capture(struct msm_gpu *gpu,

drivers/media/platform/qcom/venus/core.c

@@ -49,7 +49,7 @@ static void venus_coredump(struct venus_core *core)
 
 	memcpy(data, mem_va, mem_size);
 	memunmap(mem_va);
-	dev_coredumpv(dev, data, mem_size, GFP_KERNEL);
+	dev_coredumpv(dev, data, mem_size);
 }
 
 static void venus_event_notify(struct venus_core *core, u32 event)

drivers/net/can/spi/mcp251xfd/mcp251xfd-dump.c

@@ -281,5 +281,5 @@ void mcp251xfd_dump(const struct mcp251xfd_priv *priv)
 	mcp251xfd_dump_end(priv, &iter);
 
 	dev_coredumpv(&priv->spi->dev, iter.start,
-		      iter.data - iter.start, GFP_KERNEL);
+		      iter.data - iter.start);
 }

drivers/net/wireless/ath/ath10k/coredump.c

@@ -1607,7 +1607,7 @@ int ath10k_coredump_submit(struct ath10k *ar)
 		return -ENODATA;
 	}
 
-	dev_coredumpv(ar->dev, dump, le32_to_cpu(dump->len), GFP_KERNEL);
+	dev_coredumpv(ar->dev, dump, le32_to_cpu(dump->len));
 
 	return 0;
 }

drivers/net/wireless/ath/wil6210/wil_crash_dump.c

@@ -117,6 +117,6 @@ void wil_fw_core_dump(struct wil6210_priv *wil)
 	/* fw_dump_data will be free in device coredump release function
 	 * after 5 min
 	 */
-	dev_coredumpv(wil_to_dev(wil), fw_dump_data, fw_dump_size, GFP_KERNEL);
+	dev_coredumpv(wil_to_dev(wil), fw_dump_data, fw_dump_size);
 	wil_info(wil, "fw core dumped, size %d bytes\n", fw_dump_size);
 }

drivers/net/wireless/broadcom/brcm80211/brcmfmac/debug.c

@@ -37,7 +37,7 @@ int brcmf_debug_create_memdump(struct brcmf_bus *bus, const void *data,
 		return err;
 	}
 
-	dev_coredumpv(bus->dev, dump, len + ramsize, GFP_KERNEL);
+	dev_coredumpv(bus->dev, dump, len + ramsize);
 
 	return 0;
 }

drivers/net/wireless/intel/iwlwifi/fw/dbg.c

@@ -2601,8 +2601,7 @@ static void iwl_fw_error_dump(struct iwl_fw_runtime *fwrt,
 					     fw_error_dump.trans_ptr->data,
 					     fw_error_dump.trans_ptr->len,
 					     fw_error_dump.fwrt_len);
-		dev_coredumpsg(fwrt->trans->dev, sg_dump_data, file_len,
-			       GFP_KERNEL);
+		dev_coredumpsg(fwrt->trans->dev, sg_dump_data, file_len);
 	}
 	vfree(fw_error_dump.fwrt_ptr);
 	vfree(fw_error_dump.trans_ptr);
@@ -2647,8 +2646,7 @@ static void iwl_fw_error_ini_dump(struct iwl_fw_runtime *fwrt,
 					     entry->data, entry->size, offs);
 			offs += entry->size;
 		}
-		dev_coredumpsg(fwrt->trans->dev, sg_dump_data, file_len,
-			       GFP_KERNEL);
+		dev_coredumpsg(fwrt->trans->dev, sg_dump_data, file_len);
 	}
 	iwl_dump_ini_list_free(&dump_list);
 }

drivers/net/wireless/marvell/mwifiex/main.c

@@ -1115,8 +1115,7 @@ void mwifiex_upload_device_dump(struct mwifiex_adapter *adapter)
 	 */
 	mwifiex_dbg(adapter, MSG,
 		    "== mwifiex dump information to /sys/class/devcoredump start\n");
-	dev_coredumpv(adapter->dev, adapter->devdump_data, adapter->devdump_len,
-		      GFP_KERNEL);
+	dev_coredumpv(adapter->dev, adapter->devdump_data, adapter->devdump_len);
 	mwifiex_dbg(adapter, MSG,
 		    "== mwifiex dump information to /sys/class/devcoredump end\n");
 

drivers/net/wireless/mediatek/mt76/mt7615/mac.c

@@ -2421,6 +2421,5 @@ void mt7615_coredump_work(struct work_struct *work)
 
 		dev_kfree_skb(skb);
 	}
-	dev_coredumpv(dev->mt76.dev, dump, MT76_CONNAC_COREDUMP_SZ,
-		      GFP_KERNEL);
+	dev_coredumpv(dev->mt76.dev, dump, MT76_CONNAC_COREDUMP_SZ);
 }

drivers/net/wireless/mediatek/mt76/mt7921/mac.c

@@ -1630,8 +1630,7 @@ void mt7921_coredump_work(struct work_struct *work)
 	}
 
 	if (dump)
-		dev_coredumpv(dev->mt76.dev, dump, MT76_CONNAC_COREDUMP_SZ,
-			      GFP_KERNEL);
+		dev_coredumpv(dev->mt76.dev, dump, MT76_CONNAC_COREDUMP_SZ);
 
 	mt7921_reset(&dev->mt76);
 }

drivers/net/wireless/realtek/rtw88/main.c

@@ -414,7 +414,7 @@ static void rtw_fwcd_dump(struct rtw_dev *rtwdev)
 	 * framework. Note that a new dump will be discarded if a previous one
 	 * hasn't been released yet.
 	 */
-	dev_coredumpv(rtwdev->dev, desc->data, desc->size, GFP_KERNEL);
+	dev_coredumpv(rtwdev->dev, desc->data, desc->size);
 }
 
 static void rtw_fwcd_free(struct rtw_dev *rtwdev, bool free_self)

drivers/net/wireless/realtek/rtw89/ser.c

@@ -127,7 +127,7 @@ static void rtw89_ser_cd_send(struct rtw89_dev *rtwdev,
 	 * will be discarded if a previous one hasn't been released by
 	 * framework yet.
 	 */
-	dev_coredumpv(rtwdev->dev, buf, sizeof(*buf), GFP_KERNEL);
+	dev_coredumpv(rtwdev->dev, buf, sizeof(*buf));
 }
 
 static void rtw89_ser_cd_free(struct rtw89_dev *rtwdev,

drivers/remoteproc/qcom_q6v5_mss.c

@@ -597,7 +597,7 @@ static void q6v5_dump_mba_logs(struct q6v5 *qproc)
 	data = vmalloc(MBA_LOG_SIZE);
 	if (data) {
 		memcpy(data, mba_region, MBA_LOG_SIZE);
-		dev_coredumpv(&rproc->dev, data, MBA_LOG_SIZE, GFP_KERNEL);
+		dev_coredumpv(&rproc->dev, data, MBA_LOG_SIZE);
 	}
 	memunmap(mba_region);
 }

drivers/remoteproc/remoteproc_coredump.c

@@ -309,7 +309,7 @@ void rproc_coredump(struct rproc *rproc)
 		phdr += elf_size_of_phdr(class);
 	}
 	if (dump_conf == RPROC_COREDUMP_ENABLED) {
-		dev_coredumpv(&rproc->dev, data, data_size, GFP_KERNEL);
+		dev_coredumpv(&rproc->dev, data, data_size);
 		return;
 	}
 
@@ -318,7 +318,7 @@ void rproc_coredump(struct rproc *rproc)
 	dump_state.header = data;
 	init_completion(&dump_state.dump_done);
 
-	dev_coredumpm(&rproc->dev, NULL, &dump_state, data_size, GFP_KERNEL,
+	dev_coredumpm(&rproc->dev, NULL, &dump_state, data_size,
 		      rproc_coredump_read, rproc_coredump_free);
 
 	/*
@@ -449,7 +449,7 @@ void rproc_coredump_using_sections(struct rproc *rproc)
 	}
 
 	if (dump_conf == RPROC_COREDUMP_ENABLED) {
-		dev_coredumpv(&rproc->dev, data, data_size, GFP_KERNEL);
+		dev_coredumpv(&rproc->dev, data, data_size);
 		return;
 	}
 
@@ -458,7 +458,7 @@ void rproc_coredump_using_sections(struct rproc *rproc)
 	dump_state.header = data;
 	init_completion(&dump_state.dump_done);
 
-	dev_coredumpm(&rproc->dev, NULL, &dump_state, data_size, GFP_KERNEL,
+	dev_coredumpm(&rproc->dev, NULL, &dump_state, data_size,
 		      rproc_coredump_read, rproc_coredump_free);
 
 	/* Wait until the dump is read and free is called. Data is freed

include/drm/drm_print.h

@@ -162,7 +162,7 @@ struct drm_print_iterator {
  *	void makecoredump(...)
  *	{
  *		...
- *		dev_coredumpm(dev, THIS_MODULE, data, 0, GFP_KERNEL,
+ *		dev_coredumpm(dev, THIS_MODULE, data, 0,
  *			coredump_read, ...)
  *	}
  *

include/linux/devcoredump.h

@@ -52,27 +52,26 @@ static inline void _devcd_free_sgtable(struct scatterlist *table)
 
 
 #ifdef CONFIG_DEV_COREDUMP
-void dev_coredumpv(struct device *dev, void *data, size_t datalen,
-		   gfp_t gfp);
+void dev_coredumpv(struct device *dev, void *data, size_t datalen);
 
 void dev_coredumpm(struct device *dev, struct module *owner,
-		   void *data, size_t datalen, gfp_t gfp,
+		   void *data, size_t datalen,
 		   ssize_t (*read)(char *buffer, loff_t offset, size_t count,
 				   void *data, size_t datalen),
 		   void (*free)(void *data));
 
 void dev_coredumpsg(struct device *dev, struct scatterlist *table,
-		    size_t datalen, gfp_t gfp);
+		    size_t datalen);
 #else
 static inline void dev_coredumpv(struct device *dev, void *data,
-				 size_t datalen, gfp_t gfp)
+				 size_t datalen)
 {
 	vfree(data);
 }
 
 static inline void
 dev_coredumpm(struct device *dev, struct module *owner,
-	      void *data, size_t datalen, gfp_t gfp,
+	      void *data, size_t datalen,
 	      ssize_t (*read)(char *buffer, loff_t offset, size_t count,
 			      void *data, size_t datalen),
 	      void (*free)(void *data))
@@ -81,7 +80,7 @@ dev_coredumpm(struct device *dev, struct module *owner,
 }
 
 static inline void dev_coredumpsg(struct device *dev, struct scatterlist *table,
-				  size_t datalen, gfp_t gfp)
+				  size_t datalen)
 {
 	_devcd_free_sgtable(table);
 }

sound/soc/intel/avs/apl.c

@@ -164,7 +164,7 @@ static int apl_coredump(struct avs_dev *adev, union avs_notify_msg *msg)
 	} while (offset < msg->ext.coredump.stack_dump_size);
 
 exit:
-	dev_coredumpv(adev->dev, dump, dump_size, GFP_KERNEL);
+	dev_coredumpv(adev->dev, dump, dump_size);
 
 	return 0;
 }

sound/soc/intel/avs/skl.c

@@ -88,7 +88,7 @@ static int skl_coredump(struct avs_dev *adev, union avs_notify_msg *msg)
 		return -ENOMEM;
 
 	memcpy_fromio(dump, avs_sram_addr(adev, AVS_FW_REGS_WINDOW), AVS_FW_REGS_SIZE);
-	dev_coredumpv(adev->dev, dump, AVS_FW_REGS_SIZE, GFP_KERNEL);
+	dev_coredumpv(adev->dev, dump, AVS_FW_REGS_SIZE);
 
 	return 0;
 }

sound/soc/intel/catpt/dsp.c

@@ -539,7 +539,7 @@ int catpt_coredump(struct catpt_dev *cdev)
 		pos += CATPT_DMA_REGS_SIZE;
 	}
 
-	dev_coredumpv(cdev->dev, dump, dump_size, GFP_KERNEL);
+	dev_coredumpv(cdev->dev, dump, dump_size);
 
 	return 0;
 }