fsi: core: Fix return of error values on failures

[ Upstream commit 910810945707fe9877ca86a0dca4e585fd05e37b ]

Currently the cfam_read and cfam_write functions return the provided
number of bytes given in the count parameter and not the error return
code in variable rc, hence all failures of read/writes are being
silently ignored. Fix this by returning the error code in rc.

Addresses-Coverity: ("Unused value")
Fixes: d1dcd6782576 ("fsi: Add cfam char devices")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Jeremy Kerr <jk@ozlabs.org>
Link: https://lore.kernel.org/r/20210603122812.83587-1-colin.king@canonical.com
Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/fsi/fsi-core.c b/drivers/fsi/fsi-core.c
index bd62236d3f9754aa1893f018af8e5f7ce430601d..5b4ca6142270eb3570fbb31d7789d0bbdee59ae1 100644 (file)
--- a/drivers/fsi/fsi-core.c
+++ b/drivers/fsi/fsi-core.c
@@ -726,7 +726,7 @@ static ssize_t cfam_read(struct file *filep, char __user *buf, size_t count,
        rc = count;
  fail:
        *offset = off;
-       return count;
+       return rc;
 }
 
 static ssize_t cfam_write(struct file *filep, const char __user *buf,
@@ -763,7 +763,7 @@ static ssize_t cfam_write(struct file *filep, const char __user *buf,
        rc = count;
  fail:
        *offset = off;
-       return count;
+       return rc;
 }
 
 static loff_t cfam_llseek(struct file *file, loff_t offset, int whence)