Hi, USB mass storage devices lock up on K2E or any Keystone2 system with more than 2GB RAM. Test case: 1) Plug in USB pen drive 2) mount udisks --mount /dev/sda1 Mounted /org/freedesktop/UDisks/devices/sda at /media/PENDRIVE 3) write to medium cp blobs/1M.bin /media/PENDRIVE 4) flush to medium sync Things lock up here with the following message within a minute. [ 103.440996] xhci-hcd xhci-hcd.0.auto: xHCI host not responding to stop endpoint command. [ 103.449083] xhci-hcd xhci-hcd.0.auto: Assuming host is dying, halting host. [ 103.456064] xhci-hcd xhci-hcd.0.auto: HC died; cleaning up [ 103.461619] usb 1-1: USB disconnect, device number 2 [ 103.511036] sd 0:0:0:0: [sda] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x01 driverbyte=0x00 [ 103.519210] sd 0:0:0:0: [sda] tag#0 CDB: opcode=0x2a 2a 00 00 07 cf 28 00 00 f0 00 [ 103.526785] blk_update_request: I/O error, dev sda, sector 511784 [ 103.533093] sd 0:0:0:0: [sda] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x01 driverbyte=0x00 [ 103.541285] sd 0:0:0:0: [sda] tag#0 CDB: opcode=0x2a 2a 00 00 07 d0 18 00 00 f0 00 [ 103.548854] blk_update_request: I/O error, dev sda, sector 512024 removing file [ 103.558340] VFS: busy inodes on changed media or resized disk sda [ 103.569007] FAT-fs (sda): Directory bread(block 30640) failed [ 103.574778] FAT-fs (sda): Directory bread(block 30641) failed [ 103.580554] FAT-fs (sda): Directory bread(block 30642) failed [ 103.586361] FAT-fs (sda): Directory bread(block 30643) failed [ 103.592134] FAT-fs (sda): Directory bread(block 30644) failed [ 103.597915] FAT-fs (sda): Directory bread(block 30645) failed [ 103.604012] FAT-fs (sda): Directory bread(block 30646) failed [ 103.610197] FAT-fs (sda): Directory bread(block 30647) failed On Keystone2, DMA can happen only in the first 2 GB of RAM. The culprit is an incorrect dma_max_pfn() which results in bounce buffers to be set outside the DMA'ble area in the SCSI layer in scsi_calculate_bounce_limit(). XHCI controller tries to accesses these non DMA'ble regions which causes the lock-up. This is explained further in the patch. cheers, -roger Roger Quadros (1): ARM: dma: fix dma_max_pfn() arch/arm/include/asm/dma-mapping.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
