From 448ac479768d6c242338ecf13569dc297f8908ce Mon Sep 17 00:00:00 2001 From: Sven Neumann Date: Thu, 22 Oct 2009 08:34:34 +0200 Subject: [PATCH] pxafb: use passed fb_var_screeninfo struct in pxafb_pan_display() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit pxafb_pan_display() used to ignore the fb_var_screeninfo parameter. Now pass it to setup_base_frame() instead of pulling default values out of fb_info. And the original patch has an issue of pxafb_pan_display() paying only attention to the 'var' parameter passed in, and Ville Syrjälä pointed out, this is potentially dangerous as user could pass in any other screeninfo parameters as well, and not only such that are relevant for display panning. This is fixed by limiting the arguments actually used to .xoffset, .yoffset and .vmode & FB_VMODE_YWRAP. Signed-off-by: Sven Neumann Cc: Ville Syrjälä Signed-off-by: Daniel Mack Signed-off-by: Eric Miao --- drivers/video/pxafb.c | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-) diff --git a/drivers/video/pxafb.c b/drivers/video/pxafb.c index 1820c4a24434..33a6aacfcbe3 100644 --- a/drivers/video/pxafb.c +++ b/drivers/video/pxafb.c @@ -80,7 +80,8 @@ static int pxafb_activate_var(struct fb_var_screeninfo *var, struct pxafb_info *); static void set_ctrlr_state(struct pxafb_info *fbi, u_int state); -static void setup_base_frame(struct pxafb_info *fbi, int branch); +static void setup_base_frame(struct pxafb_info *fbi, + struct fb_var_screeninfo *var, int branch); static int setup_frame_dma(struct pxafb_info *fbi, int dma, int pal, unsigned long offset, size_t size); @@ -531,12 +532,22 @@ static int pxafb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info) { struct pxafb_info *fbi = (struct pxafb_info *)info; + struct fb_var_screeninfo newvar; int dma = DMA_MAX + DMA_BASE; if (fbi->state != C_ENABLE) return 0; - setup_base_frame(fbi, 1); + /* Only take .xoffset, .yoffset and .vmode & FB_VMODE_YWRAP from what + * was passed in and copy the rest from the old screeninfo. + */ + memcpy(&newvar, &fbi->fb.var, sizeof(newvar)); + newvar.xoffset = var->xoffset; + newvar.yoffset = var->yoffset; + newvar.vmode &= ~FB_VMODE_YWRAP; + newvar.vmode |= var->vmode & FB_VMODE_YWRAP; + + setup_base_frame(fbi, &newvar, 1); if (fbi->lccr0 & LCCR0_SDS) lcd_writel(fbi, FBR1, fbi->fdadr[dma + 1] | 0x1); @@ -1052,9 +1063,10 @@ static int setup_frame_dma(struct pxafb_info *fbi, int dma, int pal, return 0; } -static void setup_base_frame(struct pxafb_info *fbi, int branch) +static void setup_base_frame(struct pxafb_info *fbi, + struct fb_var_screeninfo *var, + int branch) { - struct fb_var_screeninfo *var = &fbi->fb.var; struct fb_fix_screeninfo *fix = &fbi->fb.fix; int nbytes, dma, pal, bpp = var->bits_per_pixel; unsigned long offset; @@ -1332,7 +1344,7 @@ static int pxafb_activate_var(struct fb_var_screeninfo *var, #endif setup_parallel_timing(fbi, var); - setup_base_frame(fbi, 0); + setup_base_frame(fbi, var, 0); fbi->reg_lccr0 = fbi->lccr0 | (LCCR0_LDM | LCCR0_SFM | LCCR0_IUM | LCCR0_EFM | -- GitLab