From d6c9ea9069af684358efedcaf2f2f687f51c58ee Mon Sep 17 00:00:00 2001 From: Ben Hutchings Date: Mon, 6 Jan 2014 03:16:32 +0000 Subject: [PATCH 1/2] xhci: Avoid infinite loop when sg urb requires too many trbs Currently prepare_ring() returns -ENOMEM if the urb won't fit into a single ring segment. usb_sg_wait() treats this error as a temporary condition and will keep retrying until something else goes wrong. The number of retries should be limited in usb_sg_wait(), but also prepare_ring() should not return an error code that suggests it might be worth retrying. Change it to -EINVAL. Reported-by: jidanni@jidanni.org References: http://bugs.debian.org/733907 Fixes: 35773dac5f86 ('usb: xhci: Link TRB must not occur within a USB payload burst') Cc: stable # 3.12 Signed-off-by: Ben Hutchings Signed-off-by: Sarah Sharp --- drivers/usb/host/xhci-ring.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 09b2b551be72..a0b248c34526 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -3000,7 +3000,7 @@ static int prepare_ring(struct xhci_hcd *xhci, struct xhci_ring *ep_ring, if (num_trbs >= TRBS_PER_SEGMENT) { xhci_err(xhci, "Too many fragments %d, max %d\n", num_trbs, TRBS_PER_SEGMENT - 1); - return -ENOMEM; + return -EINVAL; } nop_cmd = cpu_to_le32(TRB_TYPE(TRB_TR_NOOP) | From f2d9b991c549f159dc9ae81f77d8206c790cbfee Mon Sep 17 00:00:00 2001 From: Sarah Sharp Date: Mon, 6 Jan 2014 13:07:03 -0800 Subject: [PATCH 2/2] xhci: Set scatter-gather limit to avoid failed block writes. Commit 35773dac5f862cb1c82ea151eba3e2f6de51ec3e "usb: xhci: Link TRB must not occur within a USB payload burst" attempted to fix an issue found with USB ethernet adapters, and inadvertently broke USB storage devices. The patch attempts to ensure that transfers never span a segment, and rejects transfers that have more than 63 entries (or possibly less, if some entries cross 64KB boundaries). usb-storage limits the maximum transfer size to 120K, and we had assumed the block layer would pass a scatter-gather list of 4K entries, resulting in no more than 31 sglist entries: http://marc.info/?l=linux-usb&m=138498190419312&w=2 That assumption was wrong, since we've seen the driver reject a write that was 218 sectors long (of probably 512 bytes each): Jan 1 07:04:49 jidanni5 kernel: [ 559.624704] xhci_hcd 0000:00:14.0: Too many fragments 79, max 63 ... Jan 1 07:04:58 jidanni5 kernel: [ 568.622583] Write(10): 2a 00 00 06 85 0e 00 00 da 00 Limit the number of scatter-gather entries to half a ring segment. That should be margin enough in case some entries cross 64KB boundaries. Increase the number of TRBs per segment from 64 to 256, which should result in ring segments fitting on a 4K page. Signed-off-by: Sarah Sharp Reported-by: jidanni@jidanni.org References: http://bugs.debian.org/733907 Fixes: 35773dac5f86 ('usb: xhci: Link TRB must not occur within a USB payload burst') Cc: stable # 3.12 --- drivers/usb/host/xhci.c | 4 ++-- drivers/usb/host/xhci.h | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index f8ffc512faf1..ad364394885a 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -4730,8 +4730,8 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks) struct device *dev = hcd->self.controller; int retval; - /* Accept arbitrarily long scatter-gather lists */ - hcd->self.sg_tablesize = ~0; + /* Limit the block layer scatter-gather lists to half a segment. */ + hcd->self.sg_tablesize = TRBS_PER_SEGMENT / 2; /* support to build packet from discontinuous buffers */ hcd->self.no_sg_constraint = 1; diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 24344aab2107..f8416639bf31 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1279,7 +1279,7 @@ union xhci_trb { * since the command ring is 64-byte aligned. * It must also be greater than 16. */ -#define TRBS_PER_SEGMENT 64 +#define TRBS_PER_SEGMENT 256 /* Allow two commands + a link TRB, along with any reserved command TRBs */ #define MAX_RSVD_CMD_TRBS (TRBS_PER_SEGMENT - 3) #define TRB_SEGMENT_SIZE (TRBS_PER_SEGMENT*16)