system hangs in case of driver


 
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Old 04-27-2006
system hangs in case of driver

hi,
i am working on device drivers in linux kernel-2.6.11. Distribution is Mandrake-10.2. Basically i have to port the driver from kernel-2.4 to kernel-2.6.11.
My system hangs,when ever an application calls select.
Basically the kernel code for select,
contains only 2 apis
void poll_wait (struct file *, wait_queue_head_t *, poll_table *);
signal_pending(current);
and atlast pollmask is returned.
What might be the problem????
Any help is welcome

regards
sriram
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usb_mid(7D)							      Devices							       usb_mid(7D)

NAME
usb_mid - USB Multi Interface Driver SYNOPSIS
device@unit-address DESCRIPTION
The usb_mid driver is a USBA (Solaris Universal Serial Bus Architecture) compliant nexus driver that binds to device level nodes of a com- posite (multi interface) device if no vendor or class specific driver is available. The usb_mid driver attempts to bind drivers to each of the composite device's interfaces. FILES
/kernel/drv/usb_mid 32-bit x86 ELF kernel module /kernel/drv/amd64/usb_mid 64-bit x86 ELF kernel module /kernel/drv/sparcv9/usb_mid 64-bit SPARC ELF kernel module ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+------------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+------------------------------+ |Architecture |SPARC, x86, PCI-based systems | +-----------------------------+------------------------------+ |Availability |SUNWusb | +-----------------------------+------------------------------+ SEE ALSO
cfgadm_usb(1M), attributes(5), usba(7D) Writing Device Drivers Universal Serial Bus Specification 1.0 and 1.1 System Administration Guide: Basic Administration http://www.sun.com/io DIAGNOSTICS
In addition to being logged, the following messages may appear on the system console. All messages are formatted in the following manner: Warning: <device path> (usb_mid<instance number>): Error Message... Cannot access <device>. Please reconnect. This device has been disconnected because a device other than the original one has been inserted. The driver informs you of this fact by displaying the name of the original device. Device not identical to the previous one on this port. Please disconnect and reconnect. Same condition as described above; however in this case, the driver is unable to identify the original device with a name string. Please disconnect and reconnect this device. A hotplug of the device is needed before it can be restored. SunOS 5.10 9 Oct 2004 usb_mid(7D)