xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

USB: Fix incorrect DMA allocations for local memory pool drivers

Browse Source 
Fix commit 7b81cb6bdd ("usb: add a HCD_DMA flag instead of
guestimating DMA capabilities") where local memory USB drivers
erroneously allocate DMA memory instead of pool memory, causing

	OHCI Unrecoverable Error, disabled
	HC died; cleaning up

The order between hcd_uses_dma() and hcd->localmem_pool is now
arranged as in hcd_buffer_alloc() and hcd_buffer_free(), with the
test for hcd->localmem_pool placed first.

As an alternative, one might consider adjusting hcd_uses_dma() with

 static inline bool hcd_uses_dma(struct usb_hcd *hcd)
 {
-	return IS_ENABLED(CONFIG_HAS_DMA) && (hcd->driver->flags & HCD_DMA);
+	return IS_ENABLED(CONFIG_HAS_DMA) &&
+		(hcd->driver->flags & HCD_DMA) &&
+		(hcd->localmem_pool == NULL);
 }

One can also consider unsetting HCD_DMA for local memory pool drivers.

Fixes: 7b81cb6bdd ("usb: add a HCD_DMA flag instead of guestimating DMA capabilities")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Fredrik Noring <noring@nocrew.org>
Link: https://lore.kernel.org/r/20191210172905.GA52526@sx9
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Fredrik Noring
2019-12-10 18:29:05 +01:00
committed by Greg Kroah-Hartman
parent 09068c1ad5
commit f8c63edfd7
2 changed files with 23 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/usb/storage/scsiglue.c
View File

@@ -135,7 +135,8 @@ static int slave_configure(struct scsi_device *sdev)
* For such controllers we need to make sure the block layer sets
* up bounce buffers in addressable memory.
*/
if (!hcd_uses_dma(bus_to_hcd(us->pusb_dev->bus)))
if (!hcd_uses_dma(bus_to_hcd(us->pusb_dev->bus)) ||
(bus_to_hcd(us->pusb_dev->bus)->localmem_pool != NULL))
blk_queue_bounce_limit(sdev->request_queue, BLK_BOUNCE_HIGH);
/*