[PATCH] 2.5.62: /proc/ide/pdcadma returns incomplete data [10/17]

[Faik Uygur]

This patch fixes the incomplete data return problem of /proc/ide/pdcadma.
When the number of consecutive read bytes are smaller than the total
data in pdcadma_get_info(), the second read() returns 0.

--- linux-2.5.62-vanilla/drivers/ide/pci/pdcadma.c	Sun Feb 23 00:08:33 2003
+++ linux-2.5.62/drivers/ide/pci/pdcadma.c	Sat Feb 22 23:36:32 2003
@@ -39,7 +39,7 @@
 static int pdcadma_get_info (char *buffer, char **addr, off_t offset, int count)
 {
 	char *p = buffer;
-	int i;
+	int i, len;
 
 	for (i = 0; i < n_pdc_devs; i++) {
 		struct pci_dev *dev	= pdc_devs[i];
@@ -51,7 +51,11 @@
 		p += sprintf(p, "PIO\n");
 
 	}
-	return p-buffer;	/* => must be less than 4k! */
+	/* p - buffer must be less than 4k! */
+	len = (p - buffer) - offset;
+	*addr = buffer + offset;
+	
+	return len > count ? count : len;
 }
 #endif  /* defined(DISPLAY_PDCADMA_TIMINGS) && defined(CONFIG_PROC_FS) */