-------------------------------------------------------- This e-mail, including any attachments, may be confidential, privileged or otherwise legally protected. It is intended only for the addressee. If you received this e-mail in error or from someone who was not authorized to send it to you, do not disseminate, copy or otherwise use this e-mail or its attachments. Please notify the sender immediately by reply e-mail and delete the e-mail from your system. -----Original Message----- From: Fawad Lateef [mailto:fawadlateef@xxxxxxxxx] Sent: Thursday, September 15, 2005 1:58 PM To: Aggarwal, Vikas (OFT) Cc: olaveth@xxxxxxxxx; kernelnewbies@xxxxxxxxxxxx Subject: Re: Interrupt problems Plzz do top-posting .......... On 9/15/05, Aggarwal, Vikas (OFT) <Vikas.Aggarwal@xxxxxxxxxxxxxxx> wrote: > > > QmsgSend called in ISR to insert in circular queue & QmsgWait called in ur > tasklet to pick(spin locked operation) from queue. > > Irqreturn_t InterruptServiceRoutine( ..............) > > { > ............. > > /*device handling */ > .......... > > QmsgSend(); > > Return IRQ_HANDLED; > > } > > > #define QUEUE_DEPTH XYZ /* Should depend on ur device */ > > Int queue[QUEUE_DEPTH]; > > Unsigned Q_head, Q_tail, Q_entries; > > #define QmsgSend() \ > > If(Q_entries == QUEUE_DEPTH) \ > > Panic(overflow); \ > > Queue[Q_tail] = "data from the device register"; \ > > Q_tail = (Q_tail + 1) % QUEUE_DEPTH; \ > > Q_entries ++; > > Tasklet_schedule(&isr_tasklet) > > > > #define QmsgWait(x) \ > > Spin_lock_irqsave(&x, flags); \ > > If(!Q_entries){ \ > > Spin_lock_irqsave(&x,flags); break;} \ I think the lock will be a unlock ..... spin_unlock_irqrestore ............ Right. Thanks for the correction!! > > "data from device register" = queue[Q_head]; \ > > Q_head = (Q_head + 1 ) % QUEUE_DEPTH ; \ > > Q_entries --; \ > > Spin_unlock_irqsave(&x, flags); > > -- Fawad Lateef -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
