linux-kernel - [PATCH] usb: host: max3421-hcd: Correctly abort a USB request.

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Message-ID: <20241124221430.1106080-1-mark.tomlinson@alliedtelesis.co.nz>
Date: Mon, 25 Nov 2024 11:14:30 +1300
From: Mark Tomlinson <mark.tomlinson@...iedtelesis.co.nz>
To: gregkh@...uxfoundation.org
Cc: linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Mark Tomlinson <mark.tomlinson@...iedtelesis.co.nz>
Subject: [PATCH] usb: host: max3421-hcd: Correctly abort a USB request.

If the current USB request was aborted, the spi thread would not respond
to any further requests. This is because the "curr_urb" pointer would
not become NULL, so no further requests would be taken off the queue.
The solution here is to set the "urb_done" flag, as this will cause the
correct handling of the URB. Also clear interrupts that should only be
expected if an URB is in progress.

Fixes: 2d53139f3162 ("Add support for using a MAX3421E chip as a host driver.")
Signed-off-by: Mark Tomlinson <mark.tomlinson@...iedtelesis.co.nz>
---
 drivers/usb/host/max3421-hcd.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/host/max3421-hcd.c b/drivers/usb/host/max3421-hcd.c
index 9fe4f48b1898..0881fdd1823e 100644
--- a/drivers/usb/host/max3421-hcd.c
+++ b/drivers/usb/host/max3421-hcd.c
@@ -779,11 +779,17 @@ max3421_check_unlink(struct usb_hcd *hcd)
 				retval = 1;
 				dev_dbg(&spi->dev, "%s: URB %p unlinked=%d",
 					__func__, urb, urb->unlinked);
-				usb_hcd_unlink_urb_from_ep(hcd, urb);
-				spin_unlock_irqrestore(&max3421_hcd->lock,
-						       flags);
-				usb_hcd_giveback_urb(hcd, urb, 0);
-				spin_lock_irqsave(&max3421_hcd->lock, flags);
+				if (urb == max3421_hcd->curr_urb) {
+					max3421_hcd->urb_done = 1;
+					max3421_hcd->hien &= ~(BIT(MAX3421_HI_HXFRDN_BIT) |
+							       BIT(MAX3421_HI_RCVDAV_BIT));
+				} else {
+					usb_hcd_unlink_urb_from_ep(hcd, urb);
+					spin_unlock_irqrestore(&max3421_hcd->lock,
+							       flags);
+					usb_hcd_giveback_urb(hcd, urb, 0);
+					spin_lock_irqsave(&max3421_hcd->lock, flags);
+				}
 			}
 		}
 	}
-- 
2.47.0