From: Ian Abbott <abbotti@mev.co.uk>
To: devel@driverdev.osuosl.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Ian Abbott <abbotti@mev.co.uk>
Subject: [PATCH 10/14] staging: comedi: amplc_pc236_common: Use 16-bit 0 for interrupt data
Date: Tue, 23 Feb 2021 14:30:51 +0000 [thread overview]
Message-ID: <20210223143055.257402-11-abbotti@mev.co.uk> (raw)
In-Reply-To: <20210223143055.257402-1-abbotti@mev.co.uk>
The Amplicon PC36AT/PCI236 common driver has an "interrupt" subdevice
that supports Comedi asynchronous commands, placing a value in the
Comedi buffer for each interrupt. The subdevice uses Comedi's 16-bit
sample format but the interrupt handler is calling
`comedi_buf_write_samples()` with the address of a 32-bit integer
`&s->state`. On bigendian machines, this will copy 2 bytes from the
wrong end of the 32-bit integer. This isn't really a problem since
`s->state` will always be 0 for this subdevice, but clean it up by using
a 16-bit variable initialized to 0 to pass the value.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
---
drivers/staging/comedi/drivers/amplc_pc236_common.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/comedi/drivers/amplc_pc236_common.c b/drivers/staging/comedi/drivers/amplc_pc236_common.c
index 043752663188..981d281e87a1 100644
--- a/drivers/staging/comedi/drivers/amplc_pc236_common.c
+++ b/drivers/staging/comedi/drivers/amplc_pc236_common.c
@@ -126,7 +126,9 @@ static irqreturn_t pc236_interrupt(int irq, void *d)
handled = pc236_intr_check(dev);
if (dev->attached && handled) {
- comedi_buf_write_samples(s, &s->state, 1);
+ unsigned short val = 0;
+
+ comedi_buf_write_samples(s, &val, 1);
comedi_handle_events(dev, s);
}
return IRQ_RETVAL(handled);
--
2.30.0
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next prev parent reply other threads:[~2021-02-23 14:32 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-23 14:30 [PATCH 00/14] staging: comedi: Fix some command data endian problems Ian Abbott
2021-02-23 14:30 ` [PATCH 01/14] staging: comedi: addi_apci_1032: Fix endian problem for COS sample Ian Abbott
2021-02-23 14:30 ` Ian Abbott
2021-02-23 14:30 ` [PATCH 02/14] staging: comedi: addi_apci_1500: Fix endian problem for command sample Ian Abbott
2021-02-23 14:30 ` Ian Abbott
2021-02-23 14:30 ` [PATCH 03/14] staging: comedi: adv_pci1710: Fix endian problem for AI command data Ian Abbott
2021-02-23 14:30 ` Ian Abbott
2021-02-23 14:30 ` [PATCH 04/14] staging: comedi: das6402: " Ian Abbott
2021-02-23 14:30 ` Ian Abbott
2021-02-23 14:30 ` [PATCH 05/14] staging: comedi: das800: " Ian Abbott
2021-02-23 14:30 ` Ian Abbott
2021-02-23 14:30 ` [PATCH 06/14] staging: comedi: dmm32at: " Ian Abbott
2021-02-23 14:30 ` Ian Abbott
2021-02-23 14:30 ` [PATCH 07/14] staging: comedi: me4000: " Ian Abbott
2021-02-23 14:30 ` Ian Abbott
2021-02-23 14:30 ` [PATCH 08/14] staging: comedi: pcl711: " Ian Abbott
2021-02-23 14:30 ` Ian Abbott
2021-02-23 14:30 ` [PATCH 09/14] staging: comedi: pcl818: " Ian Abbott
2021-02-23 14:30 ` Ian Abbott
2021-02-23 14:30 ` Ian Abbott [this message]
2021-02-23 14:30 ` [PATCH 11/14] staging: comedi: comedi_parport: Use 16-bit 0 for interrupt data Ian Abbott
2021-02-23 14:30 ` [PATCH 12/14] staging: comedi: ni_6527: " Ian Abbott
2021-02-23 14:30 ` [PATCH 13/14] staging: comedi: ni_65xx: " Ian Abbott
2021-02-23 14:30 ` [PATCH 14/14] staging: comedi: pcl726: " Ian Abbott
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