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[bugfix] Fix compatibility issues with older kernel versions #117

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Merged
agicy merged 1 commit into from
Aug 11, 2026
Merged

[bugfix] Fix compatibility issues with older kernel versions #117

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9 changes: 9 additions & 0 deletions driver/virtio/scmi/reset.c
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Original file line number Diff line number Diff line change
Expand Up @@ -104,11 +104,18 @@ static int reset_domain(u32 reset_id, u32 flags, u32 reset_state) {
if (IS_ERR(rstc))
return PTR_ERR(rstc);

/*
* reset_control_acquire()/reset_control_release() were added in v5.2
* together with the 'acquired' state for exclusive reset controls.
* Older kernels hold exclusive resets by default; assert/deassert directly.
*/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)
ret = reset_control_acquire(rstc);
if (ret) {
pr_err("Failed to acquire reset domain %u: %d\n", reset_id, ret);
return ret;
}
#endif

switch (flags) {
case SCMI_RESET_DEASSERT:
Expand All @@ -133,7 +140,9 @@ static int reset_domain(u32 reset_id, u32 flags, u32 reset_state) {
}

out:
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 2, 0)
reset_control_release(rstc);
#endif
return ret;
}

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