Revert "kexec: add kexec_device_shutdown()"

This reverts commit 3f5824d84929e058b82a0dcd28a6a8b13339cc00.
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

include/linux/kexec.h

@@ -275,7 +275,6 @@ int kexec_should_crash(struct task_struct *);
 int kexec_crash_loaded(void);
 void crash_save_cpu(struct pt_regs *regs, int cpu);
 extern int kimage_crash_copy_vmcoreinfo(struct kimage *image);
-extern void kexec_device_shutdown(void);
 
 extern struct kimage *kexec_image;
 extern struct kimage *kexec_crash_image;
@@ -365,7 +364,6 @@ static inline void __crash_kexec(struct pt_regs *regs) { }
 static inline void crash_kexec(struct pt_regs *regs) { }
 static inline int kexec_should_crash(struct task_struct *p) { return 0; }
 static inline int kexec_crash_loaded(void) { return 0; }
-static inline void kexec_device_shutdown(void) { };
 #define kexec_in_progress false
 #endif /* CONFIG_KEXEC_CORE */
 

kernel/kexec_core.c

@@ -923,39 +923,6 @@ struct kimage *kexec_image;
 struct kimage *kexec_crash_image;
 int kexec_load_disabled;
 
-void kexec_device_shutdown(void)
-{
-	int len;
-	char *p = saved_command_line;
-
-	p = strstr(p, "kexec_shutdown_device=");
-	if (p) {
-		int i;
-		char c;
-		char drv_name[128];
-
-		memset(drv_name, 0, 128);
-		p += strlen("kexec_shutdown_device=");
-		c = *p;
-		i = 0;
-		while (c != '\0' && c != ' ') {
-			if (c != '\\' && i < 127) {
-				drv_name[i] = c;
-				i++;
-			} else if (drv_name[0] != '\0') {
-				pr_info("drv name:%s\n", drv_name);
-				device_shutdown_by_driver(drv_name);
-				memset(drv_name, 0, 128);
-				i = 0;
-			}
-			p++;
-			c = *p;
-		}
-		if (drv_name[0] != '\0')
-			device_shutdown_by_driver(drv_name);
-	}
-}
-
 /*
  * No panic_cpu check version of crash_kexec().  This function is called
  * only when panic_cpu holds the current CPU number; this is the only CPU
@@ -977,8 +944,6 @@ void __noclone __crash_kexec(struct pt_regs *regs)
 
 			crash_setup_regs(&fixed_regs, regs);
 			crash_save_vmcoreinfo();
-			if (!crash_kexec_post_notifiers)
-				kexec_device_shutdown();
 			machine_crash_shutdown(&fixed_regs);
 			machine_kexec(kexec_crash_image);
 		}

kernel/panic.c

@@ -209,7 +209,6 @@ void panic(const char *fmt, ...)
 		 * kmsg_dump, we will need architecture dependent extra
 		 * works in addition to stopping other CPUs.
 		 */
-		kexec_device_shutdown();
 		crash_smp_send_stop();
 	}