From: Muchun Song songmuchun@bytedance.com
[ Upstream commit 10a6de19cad6efb9b49883513afb810dc265fca2 ]
DEFINE_PROC_SHOW_ATTRIBUTE() is supposed to be used to define a series of functions and variables to register proc file easily. And the users can use proc_create_data() to pass their own private data and get it via seq->private in the callback. Unfortunately, the proc file system use PDE_DATA() to get private data instead of inode->i_private. So fix it. Fortunately, there only one user of it which does not pass any private data, so this bug does not break any in-tree codes.
Link: https://lkml.kernel.org/r/20211029032638.84884-1-songmuchun@bytedance.com Fixes: 97a32539b956 ("proc: convert everything to "struct proc_ops"") Signed-off-by: Muchun Song songmuchun@bytedance.com Cc: Andy Shevchenko andriy.shevchenko@linux.intel.com Cc: Stephen Rothwell sfr@canb.auug.org.au Cc: Florent Revest revest@chromium.org Cc: Alexey Dobriyan adobriyan@gmail.com Cc: Christian Brauner christian.brauner@ubuntu.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- include/linux/seq_file.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/linux/seq_file.h b/include/linux/seq_file.h index dd99569595fd3..5733890df64f5 100644 --- a/include/linux/seq_file.h +++ b/include/linux/seq_file.h @@ -194,7 +194,7 @@ static const struct file_operations __name ## _fops = { \ #define DEFINE_PROC_SHOW_ATTRIBUTE(__name) \ static int __name ## _open(struct inode *inode, struct file *file) \ { \ - return single_open(file, __name ## _show, inode->i_private); \ + return single_open(file, __name ## _show, PDE_DATA(inode)); \ } \ \ static const struct proc_ops __name ## _proc_ops = { \