https://github.com/torvalds/linux
Revision 4c7bcb51ae25f79e3733982e5d0cd8ce8640ddfc authored by Hans de Goede on 21 December 2020, 18:56:47 UTC, committed by Thomas Gleixner on 05 February 2021, 19:48:28 UTC
Since commit a85a6c86c25b ("driver core: platform: Clarify that IRQ 0 is invalid"), having a linux-irq with number 0 will trigger a WARN() when calling platform_get_irq*() to retrieve that linux-irq. Since [devm_]irq_alloc_desc allocs a single irq and since irq 0 is not used on some systems, it can return 0, triggering that WARN(). This happens e.g. on Intel Bay Trail and Cherry Trail devices using the LPE audio engine for HDMI audio: 0 is an invalid IRQ number WARNING: CPU: 3 PID: 472 at drivers/base/platform.c:238 platform_get_irq_optional+0x108/0x180 Modules linked in: snd_hdmi_lpe_audio(+) ... Call Trace: platform_get_irq+0x17/0x30 hdmi_lpe_audio_probe+0x4a/0x6c0 [snd_hdmi_lpe_audio] ---[ end trace ceece38854223a0b ]--- Change the 'from' parameter passed to __[devm_]irq_alloc_descs() by the [devm_]irq_alloc_desc macros from 0 to 1, so that these macros will no longer return 0. Fixes: a85a6c86c25b ("driver core: platform: Clarify that IRQ 0 is invalid") Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20201221185647.226146-1-hdegoede@redhat.com
1 parent 4c457e8
Tip revision: 4c7bcb51ae25f79e3733982e5d0cd8ce8640ddfc authored by Hans de Goede on 21 December 2020, 18:56:47 UTC
genirq: Prevent [devm_]irq_alloc_desc from returning irq 0
genirq: Prevent [devm_]irq_alloc_desc from returning irq 0
Tip revision: 4c7bcb5
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