From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Pete Zaitcev <zaitcev@redhat.com>,
Jeremy Figgins <kernel@jeremyfiggins.com>
Subject: [PATCH 4.14 11/30] USB: usblp: dont call usb_set_interface if theres a single alt
Date: Mon, 8 Feb 2021 16:00:57 +0100 [thread overview]
Message-ID: <20210208145805.712379584@linuxfoundation.org> (raw)
In-Reply-To: <20210208145805.239714726@linuxfoundation.org>
From: Jeremy Figgins <kernel@jeremyfiggins.com>
commit d8c6edfa3f4ee0d45d7ce5ef18d1245b78774b9d upstream.
Some devices, such as the Winbond Electronics Corp. Virtual Com Port
(Vendor=0416, ProdId=5011), lockup when usb_set_interface() or
usb_clear_halt() are called. This device has only a single
altsetting, so it should not be necessary to call usb_set_interface().
Acked-by: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Jeremy Figgins <kernel@jeremyfiggins.com>
Link: https://lore.kernel.org/r/YAy9kJhM/rG8EQXC@watson
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/usb/class/usblp.c | 19 +++++++++++--------
1 file changed, 11 insertions(+), 8 deletions(-)
--- a/drivers/usb/class/usblp.c
+++ b/drivers/usb/class/usblp.c
@@ -1340,14 +1340,17 @@ static int usblp_set_protocol(struct usb
if (protocol < USBLP_FIRST_PROTOCOL || protocol > USBLP_LAST_PROTOCOL)
return -EINVAL;
- alts = usblp->protocol[protocol].alt_setting;
- if (alts < 0)
- return -EINVAL;
- r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
- if (r < 0) {
- printk(KERN_ERR "usblp: can't set desired altsetting %d on interface %d\n",
- alts, usblp->ifnum);
- return r;
+ /* Don't unnecessarily set the interface if there's a single alt. */
+ if (usblp->intf->num_altsetting > 1) {
+ alts = usblp->protocol[protocol].alt_setting;
+ if (alts < 0)
+ return -EINVAL;
+ r = usb_set_interface(usblp->dev, usblp->ifnum, alts);
+ if (r < 0) {
+ printk(KERN_ERR "usblp: can't set desired altsetting %d on interface %d\n",
+ alts, usblp->ifnum);
+ return r;
+ }
}
usblp->bidir = (usblp->protocol[protocol].epread != NULL);
next prev parent reply other threads:[~2021-02-08 15:55 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-08 15:00 [PATCH 4.14 00/30] 4.14.221-rc1 review Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.14 01/30] USB: serial: cp210x: add pid/vid for WSDA-200-USB Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.14 02/30] USB: serial: cp210x: add new VID/PID for supporting Teraoka AD2000 Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.14 03/30] USB: serial: option: Adding support for Cinterion MV31 Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.14 04/30] Input: i8042 - unbreak Pegatron C15B Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.14 05/30] arm64: dts: ls1046a: fix dcfg address range Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.14 06/30] net: lapb: Copy the skb before sending a packet Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.14 07/30] objtool: Support Clang non-section symbols in ORC generation Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.14 08/30] elfcore: fix building with clang Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.14 09/30] ipv4: fix race condition between route lookup and invalidation Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.14 10/30] USB: gadget: legacy: fix an error code in eth_bind() Greg Kroah-Hartman
2021-02-08 15:00 ` Greg Kroah-Hartman [this message]
2021-02-08 15:00 ` [PATCH 4.14 12/30] usb: dwc2: Fix endpoint direction check in ep_from_windex Greg Kroah-Hartman
2021-02-08 15:00 ` [PATCH 4.14 13/30] ovl: fix dentry leak in ovl_get_redirect Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.14 14/30] mac80211: fix station rate table updates on assoc Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.14 15/30] kretprobe: Avoid re-registration of the same kretprobe earlier Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.14 16/30] xhci: fix bounce buffer usage for non-sg list case Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.14 17/30] cifs: report error instead of invalid when revalidating a dentry fails Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.14 18/30] smb3: Fix out-of-bounds bug in SMB2_negotiate() Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.14 19/30] mmc: core: Limit retries when analyse of SDIO tuples fails Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.14 20/30] nvme-pci: avoid the deepest sleep state on Kingston A2000 SSDs Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.14 21/30] ARM: footbridge: fix dc21285 PCI configuration accessors Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.14 22/30] mm: hugetlbfs: fix cannot migrate the fallocated HugeTLB page Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.14 23/30] mm: hugetlb: fix a race between isolating and freeing page Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.14 24/30] mm: hugetlb: remove VM_BUG_ON_PAGE from page_huge_active Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.14 25/30] mm: thp: fix MADV_REMOVE deadlock on shmem THP Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.14 26/30] x86/build: Disable CET instrumentation in the kernel Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.14 27/30] x86/apic: Add extra serialization for non-serializing MSRs Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.14 28/30] Input: xpad - sync supported devices with fork on GitHub Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.14 29/30] iommu/vt-d: Do not use flush-queue when caching-mode is on Greg Kroah-Hartman
2021-02-08 15:01 ` [PATCH 4.14 30/30] net: dsa: mv88e6xxx: override existent unicast portvec in port_fdb_add Greg Kroah-Hartman
2021-02-09 17:34 ` [PATCH 4.14 00/30] 4.14.221-rc1 review Naresh Kamboju
2021-02-09 18:10 ` Guenter Roeck
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