s390/dasd/cio: Interpret ccw_device_get_mdc return value correctly

[ Upstream commit dd4b3c83b9efac10d48a94c61372119fc555a077 ]

The max data count (mdc) is an unsigned 16-bit integer value as per AR
documentation and is received via ccw_device_get_mdc() for a specific
path mask from the CIO layer. The function itself also always returns a
positive mdc value or 0 in case mdc isn't supported or couldn't be
determined.

Though, the comment for this function describes a negative return value
to indicate failures.

As a result, the DASD device driver interprets the return value of
ccw_device_get_mdc() incorrectly. The error case is essentially a dead
code path.

To fix this behaviour, check explicitly for a return value of 0 and
change the comment for ccw_device_get_mdc() accordingly.

This fix merely enables the error code path in the DASD functions
get_fcx_max_data() and verify_fcx_max_data(). The actual functionality
stays the same and is still correct.

Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Acked-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index c94184d..f5622f4 100644 (file)
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -1128,7 +1128,8 @@ static u32 get_fcx_max_data(struct dasd_device *device)
 {
        struct dasd_eckd_private *private = device->private;
        int fcx_in_css, fcx_in_gneq, fcx_in_features;
-       int tpm, mdc;
+       unsigned int mdc;
+       int tpm;
 
        if (dasd_nofcx)
                return 0;
@@ -1142,7 +1143,7 @@ static u32 get_fcx_max_data(struct dasd_device *device)
                return 0;
 
        mdc = ccw_device_get_mdc(device->cdev, 0);
-       if (mdc < 0) {
+       if (mdc == 0) {
                dev_warn(&device->cdev->dev, "Detecting the maximum supported data size for zHPF requests failed\n");
                return 0;
        } else {
@@ -1153,12 +1154,12 @@ static u32 get_fcx_max_data(struct dasd_device *device)
 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
 {
        struct dasd_eckd_private *private = device->private;
-       int mdc;
+       unsigned int mdc;
        u32 fcx_max_data;
 
        if (private->fcx_max_data) {
                mdc = ccw_device_get_mdc(device->cdev, lpm);
-               if ((mdc < 0)) {
+               if (mdc == 0) {
                        dev_warn(&device->cdev->dev,
                                 "Detecting the maximum data size for zHPF "
                                 "requests failed (rc=%d) for a new path %x\n",

diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c
index 65841af..ccecf6b 100644 (file)
--- a/drivers/s390/cio/device_ops.c
+++ b/drivers/s390/cio/device_ops.c
@@ -635,7 +635,7 @@ EXPORT_SYMBOL(ccw_device_tm_start_timeout);
  * @mask: mask of paths to use
  *
  * Return the number of 64K-bytes blocks all paths at least support
- * for a transport command. Return values <= 0 indicate failures.
+ * for a transport command. Return value 0 indicates failure.
  */
 int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask)
 {