Messages in this thread | | | Date | Fri, 05 Oct 2007 14:36:09 +0300 | From | Anssi Hannula <> | Subject | Re: [2.6.23-rc9 regression] commit 4f01a757 broke HAL input support |
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Ben Gamari wrote: > On Thu, 2007-10-04 at 22:40 -0400, Dmitry Torokhov wrote: >> 4f01a757e75f2a3cab2bab89c4176498963946b9. > > The change that Dmitry proposed would still require > CONFIG_SYSFS_DEPRECATED, right?
What proposed change? The changeset you quote is already applied.
Andrey Borzenkov wrote: >> Actually this specific problem was introduced by >> 4f01a757e75f2a3cab2bab89c4176498963946b9. This commit seems to have >> completely disassociated eventX from corresponding inputY >> >> To summarize. >> >> 1. Any kernel with SYSFS_DEPRECATED unset >> >> events are sent for /devices/... >> /devices/.../eventX is direct child of /devices/.../inputY >> HAL checks for parent of eventX, finds inputY and is happy >> >> 2. SYSFS_DEPRECATED=y, pre-2.6.23 kernel >> >> events are sent for /class/... >> /class/.../eventX is direct child of /class/.../inputY >> HAL checks for parent of eventX, finds inputY and works >> >> 3. SYSFS_DEPRECATED=y, 2.6.23 before commit >> 4f01a757e75f2a3cab2bab89c4176498963946b9. >> >> events are sent for /class/... >> /class/.../eventX is *not* child of /class/.../inputY >> /class/.../eventX/device points to .../inputY >> HAL checks for .../device link, finds inputY and works >> >> 4. SYSFS_DEPRECATED=y, 2.6.23 after commit >> 4f01a757e75f2a3cab2bab89c4176498963946b9. >> >> /class/.../eventX is *not* child of /class/.../inputY >> /class/.../eventX/device points to some physical device >> HAL finds inputY neither as ../inputY nor as device link and breaks >> >> But what is worse, now the only way to find which inputY corresponds to which >> eventX is to scan the whole /class/input, check for device link and compare.
>> I am afraid that we have to bite the bullet and just accept that 2.6.23 breaks >> user space this way or that. Frankly fixing path_id seems to be the least >> evil.
I'd hate to see such breakage. IMO the sysfs structure of input devices should be made compatible with both HAL and udev, with both CONFIG_SYSFS_DEPRECATED and without it, as in 2.6.22 and before.
>> Is it possible to fall back to /class/input/inputX/eventY if SYSFS_DEPRECATED >> is set?
Hopefully.
-- Anssi Hannula - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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