diff options
| author | Marco Pagani <marpagan@redhat.com> | 2023-01-25 15:06:22 +0100 |
|---|---|---|
| committer | Xu Yilun <yilun.xu@intel.com> | 2023-01-28 16:34:06 +0100 |
| commit | 48ca6e5fa4ffc40a14fe45bd5499428a5a108a68 (patch) | |
| tree | d05ba4665a4c547ee1c7cfc4623fe79a00ad23cc /drivers/fpga | |
| parent | fpga: dfl: more kernel-doc corrections (diff) | |
| download | linux-48ca6e5fa4ffc40a14fe45bd5499428a5a108a68.tar.xz linux-48ca6e5fa4ffc40a14fe45bd5499428a5a108a68.zip | |
fpga: bridge: return errors in the show() method of the "state" attribute
This patch changes the show() method of the "state" sysfs attribute to
propagate errors returned by the enable_show() op. In this way,
userspace can distinguish between when the bridge is actually "enabled"
(i.e., allowing signals) or "disabled" (i.e., gating signals), or when
there is an error.
Currently, enable_show() returns an integer representing the bridge's
state (enabled or disabled) or an error code. However, this integer
value is interpreted in state_show() as a bool, resulting in the method
printing "enabled" (i.e., the bridge allows signals to pass), without
propagating the error, even when enable_show() returns an error code.
Signed-off-by: Marco Pagani <marpagan@redhat.com>
Acked-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/20230125140622.176870-1-marpagan@redhat.com
Signed-off-by: Xu Yilun <yilun.xu@intel.com>
Diffstat (limited to 'drivers/fpga')
| -rw-r--r-- | drivers/fpga/fpga-bridge.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/drivers/fpga/fpga-bridge.c b/drivers/fpga/fpga-bridge.c index 727704431f61..5cd40acab5bf 100644 --- a/drivers/fpga/fpga-bridge.c +++ b/drivers/fpga/fpga-bridge.c @@ -293,12 +293,15 @@ static ssize_t state_show(struct device *dev, struct device_attribute *attr, char *buf) { struct fpga_bridge *bridge = to_fpga_bridge(dev); - int enable = 1; + int state = 1; - if (bridge->br_ops && bridge->br_ops->enable_show) - enable = bridge->br_ops->enable_show(bridge); + if (bridge->br_ops && bridge->br_ops->enable_show) { + state = bridge->br_ops->enable_show(bridge); + if (state < 0) + return state; + } - return sprintf(buf, "%s\n", enable ? "enabled" : "disabled"); + return sysfs_emit(buf, "%s\n", state ? "enabled" : "disabled"); } static DEVICE_ATTR_RO(name); |