linux-kernel - [PATCH] staging: android: ashmem: lseek failed due to no FMODE

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Message-Id: <1491489029-11052-1-git-send-email-zhangshuxiaomi@gmail.com>
Date:   Thu,  6 Apr 2017 22:30:29 +0800
From:   zhangshuxiaomi@...il.com
To:     gregkh@...uxfoundation.org
Cc:     ghackmann@...gle.com, arve@...roid.com, riandrews@...roid.com,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        zhangshuxiao <zhangshuxiao@...omi.com>
Subject: [PATCH] staging: android: ashmem: lseek failed due to no FMODE_LSEEK.

From: zhangshuxiao <zhangshuxiao@...omi.com>

vfs_llseek will check whether the file mode has
FMODE_LSEEK, no return failure. But ashmem can be
lseek, so add FMODE_LSEEK to ashmem file.

Signed-off-by: Shuxiao Zhang <zhangshuxiao@...omi.com>
Tested-by: Greg Hackmann <ghackmann@...gle.com>
---
 drivers/staging/android/ashmem.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/staging/android/ashmem.c b/drivers/staging/android/ashmem.c
index 3f11332..e4530ac 100644
--- a/drivers/staging/android/ashmem.c
+++ b/drivers/staging/android/ashmem.c
@@ -392,6 +392,7 @@ static int ashmem_mmap(struct file *file, struct vm_area_struct *vma)
 			ret = PTR_ERR(vmfile);
 			goto out;
 		}
+		vmfile->f_mode |= FMODE_LSEEK;
 		asma->file = vmfile;
 	}
 	get_file(asma->file);
-- 
1.9.1