fbdev: Don't re-validate info->state in fb_ops implementations

The file-op entry points fb_read() and fb_write() verify that
info->state has been set to FBINFO_STATE_RUNNING. Remove the same
test from the implementations of struct fb_ops.{fb_read,fb_write}.

v2:
	* also remove test from ivtvfb, braodsheetfb, hecubafb and
	  metronomefb (Geert)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Tested-by: Sui Jingfeng <suijingfeng@loongson.cn>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Helge Deller <deller@gmx.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230428122452.4856-17-tzimmermann@suse.de

Author: tdz

drivers/media/pci/ivtv/ivtvfb.c

@@ -378,9 +378,6 @@ static ssize_t ivtvfb_write(struct fb_info *info, const char __user *buf,
 	unsigned long dma_size;
 	u16 lead = 0, tail = 0;
 
-	if (info->state != FBINFO_STATE_RUNNING)
-		return -EPERM;
-
 	total_size = info->screen_size;
 
 	if (total_size == 0)

drivers/video/fbdev/broadsheetfb.c

@@ -1013,9 +1013,6 @@ static ssize_t broadsheetfb_write(struct fb_info *info, const char __user *buf,
 	int err = 0;
 	unsigned long total_size;
 
-	if (info->state != FBINFO_STATE_RUNNING)
-		return -EPERM;
-
 	total_size = info->fix.smem_len;
 
 	if (p > total_size)

drivers/video/fbdev/core/fb_sys_fops.c

@@ -22,9 +22,6 @@ ssize_t fb_sys_read(struct fb_info *info, char __user *buf, size_t count,
 	unsigned long total_size, c;
 	ssize_t ret;
 
-	if (info->state != FBINFO_STATE_RUNNING)
-		return -EPERM;
-
 	total_size = info->screen_size;
 
 	if (total_size == 0)
@@ -64,9 +61,6 @@ ssize_t fb_sys_write(struct fb_info *info, const char __user *buf,
 	unsigned long total_size, c;
 	size_t ret;
 
-	if (info->state != FBINFO_STATE_RUNNING)
-		return -EPERM;
-
 	total_size = info->screen_size;
 
 	if (total_size == 0)

drivers/video/fbdev/hecubafb.c

@@ -163,9 +163,6 @@ static ssize_t hecubafb_write(struct fb_info *info, const char __user *buf,
 	int err = 0;
 	unsigned long total_size;
 
-	if (info->state != FBINFO_STATE_RUNNING)
-		return -EPERM;
-
 	total_size = info->fix.smem_len;
 
 	if (p > total_size)

drivers/video/fbdev/metronomefb.c

@@ -523,9 +523,6 @@ static ssize_t metronomefb_write(struct fb_info *info, const char __user *buf,
 	int err = 0;
 	unsigned long total_size;
 
-	if (info->state != FBINFO_STATE_RUNNING)
-		return -EPERM;
-
 	total_size = info->fix.smem_len;
 
 	if (p > total_size)

drivers/video/fbdev/sm712fb.c

@@ -1031,9 +1031,6 @@ static ssize_t smtcfb_read(struct fb_info *info, char __user *buf,
 	if (!info || !info->screen_base)
 		return -ENODEV;
 
-	if (info->state != FBINFO_STATE_RUNNING)
-		return -EPERM;
-
 	total_size = info->screen_size;
 
 	if (total_size == 0)
@@ -1097,9 +1094,6 @@ static ssize_t smtcfb_write(struct fb_info *info, const char __user *buf,
 	if (!info || !info->screen_base)
 		return -ENODEV;
 
-	if (info->state != FBINFO_STATE_RUNNING)
-		return -EPERM;
-
 	total_size = info->screen_size;
 
 	if (total_size == 0)