4.19-stable review patch. If anyone has any objections, please let me know.
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From: yuan linyu yuanlinyu@hihonor.com
commit b2d2d7ea0dd09802cf5a0545bf54d8ad8987d20c upstream.
When write UDC to empty and unbind gadget driver from gadget device, it is possible that there are many queue failures for mass storage function.
The root cause is mass storage main thread alaways try to queue request to receive a command from host if running flag is on, on platform like dwc3, if pull down called, it will not queue request again and return -ESHUTDOWN, but it not affect running flag of mass storage function.
Check return code from mass storage function and clear running flag if it is -ESHUTDOWN, also indicate start in/out transfer failure to break loops.
Cc: stable stable@kernel.org Signed-off-by: yuan linyu yuanlinyu@hihonor.com Reviewed-by: Alan Stern stern@rowland.harvard.edu Link: https://lore.kernel.org/r/20240123034829.3848409-1-yuanlinyu@hihonor.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/usb/gadget/function/f_mass_storage.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-)
--- a/drivers/usb/gadget/function/f_mass_storage.c +++ b/drivers/usb/gadget/function/f_mass_storage.c @@ -574,21 +574,37 @@ static int start_transfer(struct fsg_dev
static bool start_in_transfer(struct fsg_common *common, struct fsg_buffhd *bh) { + int rc; + if (!fsg_is_set(common)) return false; bh->state = BUF_STATE_SENDING; - if (start_transfer(common->fsg, common->fsg->bulk_in, bh->inreq)) + rc = start_transfer(common->fsg, common->fsg->bulk_in, bh->inreq); + if (rc) { bh->state = BUF_STATE_EMPTY; + if (rc == -ESHUTDOWN) { + common->running = 0; + return false; + } + } return true; }
static bool start_out_transfer(struct fsg_common *common, struct fsg_buffhd *bh) { + int rc; + if (!fsg_is_set(common)) return false; bh->state = BUF_STATE_RECEIVING; - if (start_transfer(common->fsg, common->fsg->bulk_out, bh->outreq)) + rc = start_transfer(common->fsg, common->fsg->bulk_out, bh->outreq); + if (rc) { bh->state = BUF_STATE_FULL; + if (rc == -ESHUTDOWN) { + common->running = 0; + return false; + } + } return true; }