From 7b4b3733fd68d986c3f790e47aa6116d229e949e Mon Sep 17 00:00:00 2001 From: Geert Uytterhoeven Date: Tue, 27 Jul 2021 15:47:26 +0200 Subject: [PATCH] video: fbdev: ssd1307fb: Propagate errors via ssd1307fb_update_display() Make ssd1307fb_update_display() return an error code, so callers that can handle failures can propagate it. Signed-off-by: Geert Uytterhoeven Acked-by: Sam Ravnborg Signed-off-by: Sam Ravnborg Link: https://patchwork.freedesktop.org/patch/msgid/20210727134730.3765898-2-geert@linux-m68k.org --- drivers/video/fbdev/ssd1307fb.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c index eda448b7a0c9..e6b6263e3bef 100644 --- a/drivers/video/fbdev/ssd1307fb.c +++ b/drivers/video/fbdev/ssd1307fb.c @@ -152,17 +152,17 @@ static inline int ssd1307fb_write_cmd(struct i2c_client *client, u8 cmd) return ret; } -static void ssd1307fb_update_display(struct ssd1307fb_par *par) +static int ssd1307fb_update_display(struct ssd1307fb_par *par) { struct ssd1307fb_array *array; u8 *vmem = par->info->screen_buffer; unsigned int line_length = par->info->fix.line_length; unsigned int pages = DIV_ROUND_UP(par->height, 8); - int i, j, k; + int ret, i, j, k; array = ssd1307fb_alloc_array(par->width * pages, SSD1307FB_DATA); if (!array) - return; + return -ENOMEM; /* * The screen is divided in pages, each having a height of 8 @@ -210,8 +210,9 @@ static void ssd1307fb_update_display(struct ssd1307fb_par *par) } } - ssd1307fb_write_array(par->client, array, par->width * pages); + ret = ssd1307fb_write_array(par->client, array, par->width * pages); kfree(array); + return ret; } @@ -222,6 +223,7 @@ static ssize_t ssd1307fb_write(struct fb_info *info, const char __user *buf, unsigned long total_size; unsigned long p = *ppos; void *dst; + int ret; total_size = info->fix.smem_len; @@ -239,7 +241,9 @@ static ssize_t ssd1307fb_write(struct fb_info *info, const char __user *buf, if (copy_from_user(dst, buf, count)) return -EFAULT; - ssd1307fb_update_display(par); + ret = ssd1307fb_update_display(par); + if (ret < 0) + return ret; *ppos += count; @@ -483,7 +487,9 @@ static int ssd1307fb_init(struct ssd1307fb_par *par) return ret; /* Clear the screen */ - ssd1307fb_update_display(par); + ret = ssd1307fb_update_display(par); + if (ret < 0) + return ret; /* Turn on the display */ ret = ssd1307fb_write_cmd(par->client, SSD1307FB_DISPLAY_ON);