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staging: gpib: Return -EINTR on device clear

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When the ATN (Attention) line is asserted during a read we get a
NIUSB_ATN_STATE_ERROR during a read. For the controller to send a
device clear it asserts ATN. Normally this is an error but in the case
of a device clear it should be regarded as an interrupt.

Return -EINTR when the Device Clear Active State (DCAS) is entered
else signal an error with dev_dbg with status instead of just dev_err.

Signed-off-by: Dave Penkler <dpenkler@gmail.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dave Penkler 2025-09-28 13:33:59 +02:00 committed by Greg Kroah-Hartman
parent 92a2b74a6b
commit aaf2af1ed1
1 changed files with 6 additions and 2 deletions
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8
drivers/staging/gpib/ni_usb/ni_usb_gpib.c
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@ -697,8 +697,12 @@ static int ni_usb_read(struct gpib_board *board, u8 *buffer, size_t length,
*/
break;
case NIUSB_ATN_STATE_ERROR:
retval = -EIO;
dev_err(&usb_dev->dev, "read when ATN set\n");
if (status.ibsta & DCAS) {
retval = -EINTR;
} else {
retval = -EIO;
dev_dbg(&usb_dev->dev, "read when ATN set stat: 0x%06x\n", status.ibsta);
}
break;
case NIUSB_ADDRESSING_ERROR:
retval = -EIO;